Hello picturelover -
We are not aware of an issue that would cause the Custom Item Specifics window to show briefly and then cease showing, so it is unclear what you may be encountering. It is possible that there may be a caching issue on your end, so clearing the cache of your preferred browser may assist, however, if it does not, please continue with your support case so we can have a look at the specifics of your account and the categories where you've encountered this.
Please be aware that we respond to support cases in the order that they arrive and we have been experiencing a higher volume of support cases recently due to the concerns about active content that have come up as a result of eBay's impending changes.
- Craig
